从列表中删除项目会导致列表变为 NoneType [英] Removing item from list causes the list to become NoneType

问题描述

我想有一个我忽略的简单解决方案.总比复杂的好，对吧?

I imagine there is a simple solution that I am overlooking. Better that than a complicated one, right?

简单地说:

var = ['p', 's', 'c', 'x', 'd'].remove('d')

导致 var 的类型为 None.这是怎么回事?

causes var to be of type None. What is going on here?

推荐答案

remove 不返回任何内容.它就地修改现有列表.无需分配.

remove doesn't return anything. It modifies the existing list in-place. No assignment needed.

替换

var = ['p', 's', 'c', 'x', 'd'].remove('d') 

与

var = ['p', 's', 'c', 'x', 'd']
var.remove('d') 

现在 var 的值为 ['p', 's', 'c', 'x'].

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